Add BunnyCDN integration, on-air website badge, publish script fixes

- On-air toggle uploads status.json to BunnyCDN + purges cache, website
  polls it every 15s to show live ON AIR / OFF AIR badge
- Publish script downloads Castopod's copy of audio for CDN upload
  (byte-exact match), removes broken slug fallback, syncs all episode
  media to CDN after publishing
- Fix f-string syntax error in publish_episode.py (Python <3.12)
- Enable CORS on BunnyCDN pull zone for json files
- CDN URLs for website OG images, stem recorder bug fixes, LLM token
  budget tweaks, session context in CLAUDE.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

website/index.html

@@ -11,13 +11,13 @@
   <!-- OG / Social -->
   <meta property="og:title" content="Luke at the Roost — Life advice for biologically questionable organisms">
   <meta property="og:description" content="The call-in talk show where Luke gives life advice to biologically questionable organisms — from a desert hermit's RV. Call in: 208-439-LUKE.">
-  <meta property="og:image" content="https://podcast.macneilmediagroup.com/media/podcasts/LukeAtTheRoost/cover_feed.png?v=3">
+  <meta property="og:image" content="https://cdn.lukeattheroost.com/media/podcasts/LukeAtTheRoost/cover_feed.png?v=3">
   <meta property="og:url" content="https://lukeattheroost.com">
   <meta property="og:type" content="website">
   <meta name="twitter:card" content="summary_large_image">
   <meta name="twitter:title" content="Luke at the Roost">
   <meta name="twitter:description" content="The call-in talk show where Luke gives life advice to biologically questionable organisms. Call in: 208-439-LUKE">
-  <meta name="twitter:image" content="https://podcast.macneilmediagroup.com/media/podcasts/LukeAtTheRoost/cover_feed.png?v=3">
+  <meta name="twitter:image" content="https://cdn.lukeattheroost.com/media/podcasts/LukeAtTheRoost/cover_feed.png?v=3">
 
   <!-- Favicon -->
   <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'%3E%3Cpath d='M32 4c-2 0-4 2-4 5 0 1 .3 2 .8 3C26 13 24 16 24 20c0 2 .5 4 1.5 5.5L22 28c-2 1-4 3-5 6l-3 10c-.5 2 .5 3 2 3h4l1-4 2 4h6l-1-6 3 6h6l-1-6 3 6h4c1.5 0 2.5-1 2-3l-3-10c-1-3-3-5-5-6l-3.5-2.5C35.5 24 36 22 36 20c0-4-2-7-4.8-8 .5-1 .8-2 .8-3 0-3-2-5-4-5z' fill='%23e8791d'/%3E%3Ccircle cx='30' cy='17' r='1.5' fill='%231a1209'/%3E%3Cpath d='M36 15c1-1 3-1 4 0s1 3 0 4' fill='none' stroke='%23cc2222' stroke-width='2' stroke-linecap='round'/%3E%3Cpath d='M28 22c2 1 4 1 6 0' fill='none' stroke='%23e8791d' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E">
@@ -33,7 +33,7 @@
     "name": "Luke at the Roost",
     "description": "The call-in talk show where Luke gives life advice to biologically questionable organisms. Broadcast from a desert hermit's RV, featuring a mix of real callers and AI-generated callers.",
     "url": "https://lukeattheroost.com",
-    "image": "https://podcast.macneilmediagroup.com/media/podcasts/LukeAtTheRoost/cover_feed.png?v=3",
+    "image": "https://cdn.lukeattheroost.com/media/podcasts/LukeAtTheRoost/cover_feed.png?v=3",
     "author": {
       "@type": "Person",
       "name": "Luke MacNeil"
@@ -71,7 +71,14 @@
       <div class="hero-info">
         <h1>Luke at the Roost</h1>
         <p class="tagline">The call-in talk show where Luke gives life advice to biologically questionable organisms.</p>
-        <div class="phone">
+        <div class="phone" id="phone-section">
+          <div class="on-air-badge" id="on-air-badge">
+            <span class="on-air-dot"></span>
+            ON AIR
+          </div>
+          <div class="off-air-badge" id="off-air-badge">
+            OFF AIR
+          </div>
           <span class="phone-label">Call in live</span>
           <span class="phone-number">208-439-LUKE</span>
           <span class="phone-digits">(208-439-5853)</span>